<template>
    <div>
      <ul
        v-if="article && article.data && article.data.length > 0"
        class="response-wrap article"
      >
        <li v-for="item in article.data" :key="item.id" class="article-list">
          <a :href="'/article?id=' + item.id" class="article-item" @click="(e) => jumpURL(e, item.id)">
            <div class="article-image">
              <img :src="item.img_url" :alt="item.title" />
            </div>
  
            <div class="article-item-content">
              <h1 class="article-title">
                {{ item.title }}
              </h1>
              <div class="article-description">
                {{ item.description }}
              </div>
  
              <div class="article-category">
                {{ item.category_info ? item.category_info.name : '' }}
              </div>
            </div>
          </a>
        </li>
      </ul>
      <div v-else class="empty-data">
        暂无数据
        <a v-if="isClear" href="/">清空搜索条件</a>
      </div>
  
      <div v-if="isLoad" class="response-wrap more" @click="loadMore">
        <div class="more-text">点击加载更多</div>
      </div>
    </div>
  </template>
  <script>
  import { mapState } from 'vuex'
  import { getArticleList } from '@/request/api/article'
  
  export default {
    name: 'HomeIndex',
    async asyncData(context) {
      const { id, keyword, category_id: categoryId, page = 1 } = context.query
  
      const [err, res] = await getArticleList({
        id,
        category_id: categoryId,
        keyword,
        page,
        is_category: 1,
        is_admin: 1,
        browse: true, // 浏览量排序
      })
  
      if (!err) {
        const isLoad = res.data.data.meta.total_pages > page
        return {
          isClear: !!keyword || !!categoryId,
          page,
          isLoad,
          categoryId,
          article: res.data.data,
        }
      }else {
        return  {
          isClear:  false,
          page: 1,
          isLoad: false,
          categoryId : "",
          article: null,
        }
      }
    },
    async fetch({ store }) {
      await store.dispatch('category/getCategoryData')
    },
    head() {
      return {
        title: '思南新闻',
        meta: [
          {
            name: 'keywords',
            content:
              '思南,博客,思南新闻,叶俊,前端开发工程师,前端性能优化,JavaScript,css,html',
          },
          {
            name: 'description',
            content: '思南新闻 - SinanNews.com，专注于前端开发技术，前端性能优化！',
          },
        ],
      }
    },
    computed: {
      ...mapState({
        categoryList: (state) => state.category.categoryList,
      }),
      // 是否为空数据
      isEmptyData() {
        return (
          this.article &&
          Array.isArray(this.article.data) &&
          this.article.data.length === 0
        )
      },
    },
    beforeDestroy() {
      if(this.progress) {
        this.progress.removeProgress()
        this.progress = null
      }
  
    },
    mounted() {
      this.$nextTick(() => {
        const ProgressIndicator = require('@/lib/progress-indicator')
        // eslint-disable-next-line no-new
        this.progress = new ProgressIndicator()
      })
    },
    methods: {
      jumpURL(e, id) {
        e.preventDefault()
        this.$router.push('/article?id=' + id)
      },
      // 获取新数据
      async fetchData(id) {
        const [err, res] = await getArticleList({
          category_id: id,
          is_category: 1,
          is_admin: 1,
          page: this.page,
          browse: true, // 浏览量排序
        })
        if (!err) {
          this.categoryId = id
          this.article.data.push(...res.data.data.data)
          this.isLoad = res.data.data.meta.total_pages > this.page
        }
      },
      // 加载更多分页
      loadMore() {
        this.page++
        this.fetchData()
      },
    },
  }
  </script>
  
  <style scoped lang="scss">
  /*文章*/
  .article-list {
    box-sizing: border-box;
    display: block;
    clear: both;
    padding: 32px 0;
    border-bottom: 1px solid #f0f0f0;
  }
  
  .article-list:hover .article-title {
    color: #0164da;
    text-decoration: underline;
  }
  
  .article-item {
    display: flex;
    height: 100%;
    width: 100%;
    text-decoration: none;
    -webkit-transition: background-color 0.35s, color 0.35s, margin 0.45s,
      -webkit-transform 0.5s;
    transition: background-color 0.35s, color 0.35s, margin 0.45s, transform 0.5s;
  }
  
  .article-image {
    width: 100px;
    & img {
      width: 100%;
      border-radius: 4px;
    }
  }
  
  .article-item-content {
    padding-left: 24px;
    flex: 1;
  }
  
  .article-title {
    font-weight: bold;
    font-size: 18px;
    color: #404040;
    padding: 0;
    margin: 0;
  }
  
  .article-description {
    font-size: 14px;
    color: #404040;
    margin: 12px 0 24px;
  }
  
  .article-category {
    font-size: 14px;
    color: #808080;
  }
  
  .empty-data {
    padding: 80px 0;
    text-align: center;
    font-size: 14px;
  }
  
  .more {
    cursor: pointer;
    padding: 32px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
  }
  .more-text {
    font-size: 16px;
    font-weight: 400;
    color: #222222;
    line-height: 22px;
  }
  .more-arrow {
    width: 16px;
    margin-top: 24px;
  }
  .more-arrow img {
    width: 100%;
  }
  
  @media screen and (max-width: 540px) {
    .article-list {
      padding: 24px 0;
    }
  
    .article-image {
      width: 90px;
    }
  }
  </style>
  